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Test Description

The number below refers to the step number on the diagnostic table.

  1. 3:  This step compares battery voltage with the voltage that the BCM calculates.
DTC B1328

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Start the engine.
  3. Increase engine speed to above 1,500 RPM.
  4. With a scan tool, observe the Battery 1 parameter in the BCM data list.
Does the scan tool indicate the battery voltage is less than the specified value?		 17 V Go to Step 4  Go to Step 3 
3 
  1. Measure the voltage across the battery terminals.
  2. Compare the battery voltage with the Battery 1 parameter in the Ignition data list of the BCM.
Are the voltages within the specified value?		 1 V Go to Charging System Test  Go to Step 4 
4 Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 6  Go to Step 5 
5
IMPORTANT: Perform the setup procedure for the BCM.
Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.Did you complete the replacement?		 - Go to Step 6  -
6
  1. Use the scan tool in order to clear the DTC.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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